\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\begin{document}
\small
\begin{tikzpicture}[>=stealth]
  \draw [pattern=north east lines](2.4,0) rectangle (2.6,1.6);	
  \pgfsetlinewidth{4pt}
  \pgfsetinnerlinewidth{3pt}
  \draw (0,0) rectangle (5,1.6);
\end{tikzpicture}
\end{document}